#include <stdio.h>
int main()
{
  void action1(int, int), action2(int, int);
  char ch;
  int a = 15, b = 23;
  ch = getchar();
  switch (ch)
  {
  case 'a':
  case 'A':
    action1(a, b);
    break;

  case 'b':
  case 'B':
    action2(a, b);
    break;

  default:
    putchar('\a');
  }
  return 0;
}

void action1(int x, int y)
{
  printf("x+y=%d\n", x + y);
}

void action2(int x, int y)
{
  printf("x*y=%d\n", x * y);
}